Structure and superconductivity of HgBa2CuO4+δ

Wagner, J. L.; Radaelli, P. G.; Hinks, D. G.; Jorgensen, J. D.; Mitchell, J. F.; Da̧browski, B.; Knapp, G. S.; Beno, M. A.

doi:10.1016/0921-4534(93)90989-4

Cited by 301 publications

(82 citation statements)

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“…Typical sample sizes were 2×1×1 mm 3 with masses ranging from 4 to 12 mg. All samples were synthesized in an evacuated quartz tube as described previously [26]. Both the single underdoped sample and the overdoped sample A were obtained from a single synthesis by subsequent annealing to produce samples with significantly different oxygen contents but similar values of T c .…”

Section: Methodsmentioning

confidence: 99%

“…For Y-123 Veal and Paulikas [44] proposed that the local rearrangement of oxygen anions in the CuO chain layer causes the valence of the ambivalent Cu 1+/2+ cations in this layer to change. [26] show that there is a substitutional defect in Hg-1201 in the form of a partial substitution of Cu ions on the Hg site; the same overdoped Hg-1201 sample A used in the present experiments was found to contain a substitution of ∼ 8% of Cu on the Hg site [27] which could conceivably lead to modest relaxation effects of the order ∼ 8% of that expected for full substitution. It is interesting to note that in the present experiment on overdoped Hg-1201 (sample A) the magnitude of the observed relaxation derivative ((dT c /dP ) relax ≈ -0.3 K/GPa) is only ∼ 10% of that for Y-123 [16] with a similar value of T c .…”

Section: B Relaxation Behavior At Ambient Pressurementioning

confidence: 99%

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Relaxation effects in the transition temperature of superconductingHgBa2CuO4+δ

et al. 1999

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In previous studies on a number of under-and overdoped high temperature superconductors, including YBa 2 Cu 3 O 7−y and Tl 2 Ba 2 CuO 6+δ , the transition temperature T c has been found to change with time in a manner which depends on the sample's detailed temperature and pressure history. This relaxation behavior in T c is believed to originate from rearrangements within the oxygen sublattice. In the present high-pressure studies on HgBa 2 CuO 4+δ to 0.8 GPa we find clear evidence for weak relaxation effects in strongly underand overdoped samples (T c ≃ 40 -50 K) with an activation energy E A (1 bar) ≃ 0.8 -0.9 eV. For overdoped HgBa 2 CuO 4+δ E A increases under pressure more rapidly than previously observed for YBa 2 Cu 3 O 6.41 , yielding an activation volume of +11 ± 5 cm 3 ; the dependence of T c on pressure is markedly nonlinear, an anomalous result for high-T c superconductors in the present pressure range, giving evidence for a change in the electronic and/or structural properties near 0.4 GPa.2

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Section: Methodsmentioning

confidence: 99%

Section: B Relaxation Behavior At Ambient Pressurementioning

confidence: 99%

Relaxation effects in the transition temperature of superconductingHgBa2CuO4+δ

et al. 1999

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“…Second, in Hg1201, disorder resides in the Hg-O layer, relatively far away from the CuO 2 layer. [16][17][18] As disorder and defects are common causes for vortex pinning, their relative absence in Hg1201 results in weak pinning 15 and is important for the formation of the VL. Third, Hg1201 features a high tetragonal structural symmetry, and the absence of long-range structural distortions 19 allows us to avoid complications due to vortex pinning at crystallographic twin boundaries.…”

Section: Introductionmentioning

confidence: 99%

Magnetic vortex lattice in HgBa2CuO4+δobserved by small-angle neutron scattering

Egetenmeyer

Gavilano

et al. 2011

Phys. Rev. B

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We report the direct observation of the magnetic vortex lattice in the model high-temperature superconductor HgBa2CuO 4+δ . Using small-angle neutron scattering on high-quality crystals, we observe two equal domains of undistorted triangular vortex lattices well-aligned with the tetragonal crystallographic axes. The signal decreases rapidly with increasing magnetic field and vanishes above 0.4 Tesla, which we attribute to a crossover from a three-dimensional to a two-dimensional vortex system, similar to previous results for the more anisotropic compound Bi2.15Sr1.95CaCu2O 8+δ . Our result indicates that a triangular vortex lattice (with or without distortion) at low magnetic fields is a generic property of cuprates with critical temperatures above 80 K.

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“…Here, the lattice parameters of underdoped HgBa 2 CuO 4+δ (T c =59 K) are used; a=3.889Å, c=9.540 A, z(Ba)=0.3016, and z(O(2))=0.2061. [13] The charges are given as Hg 2+ , Ba 2+ , Cu 2+ , and O 2− . Following the style of Fig.…”

Section: Resultsmentioning

confidence: 99%

Non-scalar contribution of potential in crystals

Uchiyama

2014

Journal of Physics and Chemistry of Solids

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Ewald-parameter dependence of Coulomb interaction in ionic crystals was studied using a point-charge model. In the presence of the long-range interaction, the ion configuration breaks spherical symmetry of local potential and charge at each ion site, and gives non-scalar contributions to them. This non-scalar potential has similar effects to Heisenberg interaction, while is intrinsically distinct from conventional multipole expansions of the scalar potential. Symmetry and magnitude of the scalar and non-scalar potentials are similar for most materials despite the different definitions, but one exception can be seen in parent materials of hole-doped high-T c cuprates.

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Structure and superconductivity of HgBa2CuO4+δ

Cited by 301 publications

References 10 publications

Relaxation effects in the transition temperature of superconductingHgBa2CuO4+δ

Relaxation effects in the transition temperature of superconductingHgBa2CuO4+δ

Magnetic vortex lattice in HgBa2CuO4+δobserved by small-angle neutron scattering

Non-scalar contribution of potential in crystals

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